---
title: "4 inch air filter — Niche Verdict: Skip it (50/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/4-inch-air-filter"
last_updated: "2026-07-09T22:54:35.168Z"
locale: en
meta:
  description: "a small market ($89K/yr) — 4 inch air filter doesn't clear our bar today."
  "og:description": "a small market ($89K/yr) — 4 inch air filter doesn't clear our bar today."
  "og:title": "4 inch air filter — Niche Verdict: Skip it (50/100) | Amazon United States - Flapen"
---

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# **4 inch air filter**

**Skip it****50/100 **

a small market ($89K/yr) — 4 inch air filter doesn't clear our bar today.

**Market/yr**

**$89K**

**Growth (1y)**

**+171.4%**

**Products**

**38**

**Brands**

**19**

was 18 a year ago

**Sellers**

**79**

**Price range**

**$9.57–$65.39**

**Returns**

**2.0%**

**Rating**

**4.5★**

**Skip it**

Scored 50/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns

Market size

**4**

 ×0.30

Growth

**73**

 ×0.30

Competition

**71**

 ×0.20

Quality gap

**38**

 ×0.10

Returns

**84**

 ×0.10

## **Demand**

Weekly Amazon search volume, last 104 weeks — +171.4% year over year.

1K654Spike '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26

## **Seasonality**

Monthly demand index across the year — 1.00 is average.

JFMAMJJASOND

No pronounced peak months · busiest ÷ quietest = 1.5×

## **Competition**

- K&N39% - RYANSTAR RACING17% - muge racing5% - MIADILA5% - TIEVISHO4% - Filtrete4% - Other (13 brands)26%

The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them. 19 brands and 79 sellers compete here.

**Brands**

**19 **▲rising

was 18 a year ago

**Sellers**

**79**

**Top 5 brand share**

**70%**

#ProductBrandPriceRatingReviewsClick shareTrend

1
![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium: Flange Diameter: 4 In Filter Height: 5.5 In Flange Length: 1.125 In Shape: Round Tapered RG-1001RD](https://m.media-amazon.com/images/I/41TqIdJ0ELL.jpg) [**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium: Flange Diameter: 4 In Filter Height: 5.5 In Flange Length: 1.125 In Shape: Round Tapered RG-1001RD**](https://www.amazon.com/dp/B00AFRIVNQ)

K&N$35.244.6★5,13615%▲rising

2
![RYANSTAR RACING 102mm 4 High Flow Round Tapered Cone Cool Air Filter Cleaner with Top Filter Design Short 231mm tall](https://m.media-amazon.com/images/I/51OejKnz2LL.jpg) [**RYANSTAR RACING 102mm 4 High Flow Round Tapered Cone Cool Air Filter Cleaner with Top Filter Design Short 231mm tall**](https://www.amazon.com/dp/B0CCS6MPJV)

RYANSTAR RACING$20.584.5★7838%▼falling

3
![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 6 In Flange Length: 1.75 In Shape: Round Tapered RE-0850](https://m.media-amazon.com/images/I/51dvrydBiWL.jpg) [**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 6 In Flange Length: 1.75 In Shape: Round Tapered RE-0850**](https://www.amazon.com/dp/B01G463QNQ)

K&N$56.734.6★2547%▲rising

4
![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.75 In Shape: Round Tapered RE-0870](https://m.media-amazon.com/images/I/31XaRNU2nQL.jpg) [**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.75 In Shape: Round Tapered RE-0870**](https://www.amazon.com/dp/B00029WZFC)

K&N$65.394.8★5896%▼falling

5
![3 3.5 4 Inch Cold Air Intake Filter 76mm 89mm 101mm High Performance Washable 3 Sizes in 1 Clamp-On Replacement Cone Air Filter Black](https://m.media-amazon.com/images/I/415EpcJ-QNL.jpg) [**3 3.5 4 Inch Cold Air Intake Filter 76mm 89mm 101mm High Performance Washable 3 Sizes in 1 Clamp-On Replacement Cone Air Filter Black**](https://www.amazon.com/dp/B0FL219PFX)

TIEVISHO$27.824.4★854%▲rising

6
![RYANSTAR Universal Clamp-on Air Intake Filter 3 In /3.5 In /4 In Three different Sizes Round Tapered High Performance Washable Replacement Air Filter For cars and motorcycles (black)](https://m.media-amazon.com/images/I/414wMoeX5gL.jpg) [**RYANSTAR Universal Clamp-on Air Intake Filter 3 In /3.5 In /4 In Three different Sizes Round Tapered High Performance Washable Replacement Air Filter For cars and motorcycles (black)**](https://www.amazon.com/dp/B07XNYFMG2)

RYANSTAR RACING$15.934.4★6664%—flat

7
![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 3.5 In Flange Length: 0.625 In Shape: Round Tapered RU-2510](https://m.media-amazon.com/images/I/31z1EC-o87L.jpg) [**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 3.5 In Flange Length: 0.625 In Shape: Round Tapered RU-2510**](https://www.amazon.com/dp/B00062YQQG)

K&N$48.284.7★2774%▲rising

8
![Red 4 100mm Inlet Cone Replacement Dry Air Filter High Flow Car Performance Cold Air Intake Filter](https://m.media-amazon.com/images/I/41ulI+TO-2L.jpg) [**Red 4 100mm Inlet Cone Replacement Dry Air Filter High Flow Car Performance Cold Air Intake Filter**](https://www.amazon.com/dp/B0C9DC1JSG)

WOOTON$19.684.6★1954%▼falling

9
![K&N Dryflow Lifetime Universal Clamp-On Air Filter: Dry Synthetic Washable Oil-Free: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.5 In Type: Dry Synthetic RU-3112HBK](https://m.media-amazon.com/images/I/41xeyN1MtUL.jpg) [**K&N Dryflow Lifetime Universal Clamp-On Air Filter: Dry Synthetic Washable Oil-Free: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.5 In Type: Dry Synthetic RU-3112HBK**](https://www.amazon.com/dp/B0BH8VFHX9)

K&N$60.054.2★283%▼falling

10

![Spectre Universal Clamp-On Air Filter: High Performance Washable Filter: Round Reverse Tapered; 3 in/3.5 in/4 in Flange ID; 2.625 in (67 mm) Height; 6 in (152 mm) Base; 4.75 in Top SPE-8161 Black](https://m.media-amazon.com/images/I/41R7-Q24LQL.jpg) [**Spectre Universal Clamp-On Air Filter: High Performance Washable Filter: Round Reverse Tapered; 3 in/3.5 in/4 in Flange ID; 2.625 in (67 mm) Height; 6 in (152 mm) Base; 4.75 in Top SPE-8161 Black**](https://www.amazon.com/dp/B005BHUXPO)

Spectre$31.194.6★4083%—flat

11

![4-Inch Cold Air Intake Filter - Washable High Performance 3 or 3-1/2 or 4 Clamp-On Replacement Cone Air Filter Universal 3 Sizes in 1 Black](https://m.media-amazon.com/images/I/41Cr2yj5wcL.jpg) [**4-Inch Cold Air Intake Filter - Washable High Performance 3 or 3-1/2 or 4 Clamp-On Replacement Cone Air Filter Universal 3 Sizes in 1 Black**](https://www.amazon.com/dp/B0DHFXZBY2)

muge racing$25.464.6★993%▲rising

12

![Cartman Clamp-On Engine Air Filter Fit Intake Tube with 3/3.5/4in Diameter Premium High Performance Replacement Filter Washable and Reusable Round Tapered Red](https://m.media-amazon.com/images/I/51bUkap4UML.jpg) [**Cartman Clamp-On Engine Air Filter Fit Intake Tube with 3/3.5/4in Diameter Premium High Performance Replacement Filter Washable and Reusable Round Tapered Red**](https://www.amazon.com/dp/B082M854HF)

CARTMAN$19.664.5★1,0763%▼falling

13

![Filtrete 20x25x4 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Honeywell & AprilAire AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.88 x 24.63 x 4.31 in)](https://m.media-amazon.com/images/I/41EDEMMdqOL.jpg) [**Filtrete 20x25x4 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Honeywell & AprilAire AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.88 x 24.63 x 4.31 in)**](https://www.amazon.com/dp/B09RQCX5YR)

Filtrete$45.024.7★1,9482%▲rising

14

![DVPARTS 4 Blue Cold Air Intake Filter DP0235 for All Rudys 4 Intakes](https://m.media-amazon.com/images/I/41ul8Jn1EvL.jpg) [**DVPARTS 4 Blue Cold Air Intake Filter DP0235 for All Rudys 4 Intakes**](https://www.amazon.com/dp/B0FCMKFC7Z)

DVPARTS$36.674.2★92%▲rising

15

![BLUE 4 102 mm Inlet Truck Air Cone Replacement Performance Washable Clamp-On Dry Air Filter (8 Tall)](https://m.media-amazon.com/images/I/61R9BhcgsBL.jpg) [**BLUE 4 102 mm Inlet Truck Air Cone Replacement Performance Washable Clamp-On Dry Air Filter (8 Tall)**](https://www.amazon.com/dp/B07DS3NMMW)

Rtunes Racing$22.224.3★2892%—flat

**~~Showing 15 of 38 — show all ~~**

## **Product shelf**

All 38 tracked products in this niche.

Top sellersNewestTrending

[![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium: Flange Diameter: 4 In Filter Height: 5.5 In Flange Length: 1.125 In Shape: Round Tapered RG-1001RD](https://m.media-amazon.com/images/I/41TqIdJ0ELL.jpg)**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium: Flange Diameter: 4 In Filter Height: 5.5 In Flange Length: 1.125 In Shape: Round Tapered RG-1001RD** K&N**$35.24**4.6★5,136 reviews](https://www.amazon.com/dp/B00AFRIVNQ) [![RYANSTAR RACING 102mm 4 High Flow Round Tapered Cone Cool Air Filter Cleaner with Top Filter Design Short 231mm tall](https://m.media-amazon.com/images/I/51OejKnz2LL.jpg)**RYANSTAR RACING 102mm 4 High Flow Round Tapered Cone Cool Air Filter Cleaner with Top Filter Design Short 231mm tall** RYANSTAR RACING**$20.58**4.5★783 reviews](https://www.amazon.com/dp/B0CCS6MPJV) [![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 6 In Flange Length: 1.75 In Shape: Round Tapered RE-0850](https://m.media-amazon.com/images/I/51dvrydBiWL.jpg)**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 6 In Flange Length: 1.75 In Shape: Round Tapered RE-0850** K&N**$56.73**4.6★254 reviews](https://www.amazon.com/dp/B01G463QNQ) [![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.75 In Shape: Round Tapered RE-0870](https://m.media-amazon.com/images/I/31XaRNU2nQL.jpg)**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 9 In Flange Length: 1.75 In Shape: Round Tapered RE-0870** K&N**$65.39**4.8★589 reviews](https://www.amazon.com/dp/B00029WZFC) [![3 3.5 4 Inch Cold Air Intake Filter 76mm 89mm 101mm High Performance Washable 3 Sizes in 1 Clamp-On Replacement Cone Air Filter Black](https://m.media-amazon.com/images/I/415EpcJ-QNL.jpg)**3 3.5 4 Inch Cold Air Intake Filter 76mm 89mm 101mm High Performance Washable 3 Sizes in 1 Clamp-On Replacement Cone Air Filter Black** TIEVISHO**$27.82**4.4★85 reviews](https://www.amazon.com/dp/B0FL219PFX) [![RYANSTAR Universal Clamp-on Air Intake Filter 3 In /3.5 In /4 In Three different Sizes Round Tapered High Performance Washable Replacement Air Filter For cars and motorcycles (black)](https://m.media-amazon.com/images/I/414wMoeX5gL.jpg)**RYANSTAR Universal Clamp-on Air Intake Filter 3 In /3.5 In /4 In Three different Sizes Round Tapered High Performance Washable Replacement Air Filter For cars and motorcycles (black)** RYANSTAR RACING**$15.93**4.4★666 reviews](https://www.amazon.com/dp/B07XNYFMG2) [![K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 3.5 In Flange Length: 0.625 In Shape: Round Tapered RU-2510](https://m.media-amazon.com/images/I/31z1EC-o87L.jpg)**K&N High-Flow Original Lifetime Universal Clamp-On Air Filter: High Performance Premium Washable: Flange Diameter: 4 In Filter Height: 3.5 In Flange Length: 0.625 In Shape: Round Tapered RU-2510** K&N**$48.28**4.7★277 reviews](https://www.amazon.com/dp/B00062YQQG) [![Red 4 100mm Inlet Cone Replacement Dry Air Filter High Flow Car Performance Cold Air Intake Filter](https://m.media-amazon.com/images/I/41ulI+TO-2L.jpg)**Red 4 100mm Inlet Cone Replacement Dry Air Filter High Flow Car Performance Cold Air Intake Filter** WOOTON**$19.68**4.6★195 reviews](https://www.amazon.com/dp/B0C9DC1JSG)

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Quality-Overall**21%

*“Great quality product,fast shipping,and honestly way better then I expected for the cost”*

**Filtration**18%

*“Strong filter”*

**Size-Overall**17%

*“Good fit as expected”*

**Value For Money**16%

*“Good price”*

**Advertised Vs Actual Product**7%

*“Worked as advertised”*

**Assembly/Installation**3%

*“Easy to install”*

**Strength**2%

*“Sturdy”*

**Efficiency**2%

*“they work great in my HVAC”*

**Ease Of Use**2%

*“Easy”*

**Smell**2%

*“Eliminates even the dankiest odors”*

### **What buyers complain about **

**Size-Overall**42%

*“DOES NOT FIT”*

**Filtration**15%

*“Filter size too larger”*

**Quality-Overall**6%

*“Quality control is not the best. for a brand name”*

**Advertised Vs Actual Product**5%

*“False advertising”*

**Compatibility-Overall**3%

*“Does not fit Honeywell filter holder”*

**Value For Money**2%

*“for $10 less per filter”*

**Thickness**2%

*“the thickness turned out to be the problem”*

**Design-Overall**2%

*“Not very well built”*

**Spray/Flow**2%

*“Flow is low”*

**Functionality-Overall**2%

*“The last one I bought is not working at all”*

#### **Top return reasons**- Size-Overall72% - Filtration10% - Compatibility-Overall8% - Value For Money4% - Advertised Vs Actual Product2% - Functionality-Overall1% - Thickness1% - Defective Material/Parts1% - Product Condition0% - Width0%